US8616645B2 - Seat lifter device - Google Patents

Seat lifter device Download PDF

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Publication number
US8616645B2
US8616645B2 US13/819,826 US201113819826A US8616645B2 US 8616645 B2 US8616645 B2 US 8616645B2 US 201113819826 A US201113819826 A US 201113819826A US 8616645 B2 US8616645 B2 US 8616645B2
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United States
Prior art keywords
seat
cushion
link
section
rotationally coupled
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US13/819,826
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English (en)
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US20130161989A1 (en
Inventor
Sadao Ito
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Aisin Corp
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Aisin Seiki Co Ltd
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Publication date
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Assigned to AISIN SEIKI KABUSHIKI KAISHA reassignment AISIN SEIKI KABUSHIKI KAISHA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ITO, SADAO
Publication of US20130161989A1 publication Critical patent/US20130161989A1/en
Application granted granted Critical
Publication of US8616645B2 publication Critical patent/US8616645B2/en
Expired - Fee Related legal-status Critical Current
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/02—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
    • B60N2/04—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable
    • B60N2/16—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable
    • B60N2/18—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable the front or the rear portion of the seat being adjustable, e.g. independently of each other
    • B60N2/185—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable the front or the rear portion of the seat being adjustable, e.g. independently of each other characterised by the drive mechanism
    • B60N2/1864—Gear wheel driven mechanism
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/02—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
    • B60N2/04—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable
    • B60N2/06—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable slidable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/02—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
    • B60N2/04—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable
    • B60N2/16—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable
    • B60N2/1605—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable characterised by the cinematic
    • B60N2/161—Rods
    • B60N2/1615—Parallelogram-like structure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/02—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
    • B60N2/04—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable
    • B60N2/16—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable
    • B60N2/1635—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable characterised by the drive mechanism
    • B60N2/165—Gear wheel driven mechanism
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/02—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
    • B60N2/04—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable
    • B60N2/16—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable
    • B60N2/18—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable the front or the rear portion of the seat being adjustable, e.g. independently of each other
    • B60N2/1807—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable the front or the rear portion of the seat being adjustable, e.g. independently of each other characterised by the cinematic
    • B60N2/181—Rods
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/02—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
    • B60N2/04—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable
    • B60N2/16—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable
    • B60N2/18—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable the front or the rear portion of the seat being adjustable, e.g. independently of each other
    • B60N2/1807—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable the front or the rear portion of the seat being adjustable, e.g. independently of each other characterised by the cinematic
    • B60N2/1839—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable the front or the rear portion of the seat being adjustable, e.g. independently of each other characterised by the cinematic pivoting about an axis located in an intermediate position
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/02—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
    • B60N2/04—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable
    • B60N2/16—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable
    • B60N2/18—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable the front or the rear portion of the seat being adjustable, e.g. independently of each other
    • B60N2/1807—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable the front or the rear portion of the seat being adjustable, e.g. independently of each other characterised by the cinematic
    • B60N2/1842—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable the front or the rear portion of the seat being adjustable, e.g. independently of each other characterised by the cinematic pivoting about an axis located in the rear
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/70—Upholstery springs ; Upholstery
    • B60N2/7094—Upholstery springs

Definitions

  • the present invention relates to a seat lifter device that adjusts the vertical position of a seat cushion.
  • a seat lifter device which allows a seat occupant to adjust the vertical position of a seat cushion in accordance with the size of the seat occupant to obtain a desired eye level.
  • a seat lifter device disclosed in Patent Document 1 includes lifter mechanisms, which are mounted on base plates on upper rails. The lifter mechanisms adjust the vertical position of the seat cushion. Brackets are fixed on the base plates, and a seat back is fixed on the brackets via reclining mechanisms. According to this seat lifter device, only the seat cushion moves vertically with respect to the base plates and the seat back.
  • the seat cushion is supported on lower frames via front links and rear links that form quadric crank chains.
  • the front links and the rear links adjust the vertical position of the seat cushion.
  • the seat back is fixed on the seat cushion via the reclining mechanisms. According to this seat lifter device, unlike the device of Patent Document 1, the seat cushion and the seat back integrally move up and down.
  • a seat back has an S-curve that corresponds to an S-curve of the back of an average sized seat occupant.
  • the S-curve of the back of the seat occupant corresponds to that of the seat back within a certain range.
  • a small or large person that is, a person having a smaller or taller height than the average adjusts the vertical position of the seat cushion to adjust the eye level
  • the S-curve of the back of the seat occupant and the S-curve of the seat back might be displaced significantly.
  • the seat cushion and the seat back integrally move up and down.
  • the S-curve of the back of a large or small person and the S-curve of the seat back might remain displaced from each other.
  • load applied to the seat back by, for example, a collision is applied to the quadric crank chains formed by the front links and the rear links. Therefore, it is necessary to increase the thickness and the width of the front links and the rear links to ensure the strength.
  • the length of the front links and the rear links is increased in order to increase the vertical adjustment amount of the seat cushion that can be adjusted by the quadric crank chains, it is necessary to further ensure the strength and the rigidity of the links.
  • the seat cushion moves upward by adjustment of the vertical position, the seat back moves upward accordingly.
  • the space between the headrest retained at the upper end of the seat back and the ceiling is decreased.
  • a seat lifter device includes a seat support member, a front link, a rear link, a frame member, a cushion member, and a rotation transmitting member.
  • the front link includes first and second ends. The first end is rotationally coupled to a front section of the seat support member.
  • the rear link includes first and second ends. The first end is rotationally coupled to a rear section of the seat support member.
  • the frame member includes a front section rotationally coupled to the second end of the front link and a rear section rotationally coupled to the second end of the rear link at a position rearward of the coupling portion between the seat support member and the rear link.
  • a seat back is supported at a rear end portion of the frame member.
  • the cushion member includes part of a seat cushion.
  • the cushion member also includes a front section rotationally coupled to the frame member and a rear section rotationally coupled to the rear link at a position further separated from the coupling portion between the seat support member and the rear link than the coupling portion between the rear link and the frame member.
  • the rotation transmitting member rotates one of the front link and the rear link.
  • FIG. 1 is a perspective view illustrating a vehicle seat to which a seat lifter device according to a first embodiment of the present invention is applied;
  • FIG. 2 is a plan view illustrating the seat lifter device of FIG. 1 ;
  • FIG. 3 is an exploded perspective view illustrating the seat lifter device of FIG. 1 ;
  • FIG. 4 is a side view illustrating operation of the seat lifter device of FIG. 1 ;
  • FIG. 5 is a side view illustrating operation of the seat lifter device of FIG. 1 ;
  • FIG. 6 is a side view illustrating operation of the seat lifter device of FIG. 1 ;
  • FIG. 7 is an exploded perspective view illustrating a seat lifter device according to a second embodiment of the present invention.
  • FIG. 8 is a side view illustrating the operation of the seat lifter device of FIG. 7 ;
  • FIG. 9 is a side view illustrating the operation of the seat lifter device of FIG. 7 .
  • FIG. 1 is a perspective view showing a seat 1 , which is a front seat of a vehicle such as an automobile.
  • a pair of lower rails 2 which face each other in the widthwise direction of the seat 1 and extend in the fore-and-aft direction, is fixed on a vehicle floor F (see FIG. 4 ).
  • An upper rail 3 is mounted on each of the lower rails 2 to be movable relative to the associated lower rail 2 .
  • the pair of lower rails 2 and the pair of upper rails 3 form a slide mechanism.
  • a plate-like bracket 4 (a seat support member), which extends upward, is coupled to each of the upper rails 3 . More specifically, as shown by a transverse sectional view in circle C in FIG. 1 , each upper rail 3 includes a pair of members 3 a , which is formed by bending plate materials that face each other. The pair of members 3 a is symmetrical. Each bracket 4 is fastened to a vertical wall formed at the center of the corresponding upper rail 3 with, for example, a bolt and a nut or a swage pin. A seat main body 5 is secured to and supported by the brackets 4 via a lifter mechanism 10 .
  • the seat main body 5 includes a seat cushion 6 , a seat back 7 , which is tiltably (rotationally) supported at the rear end portion of the seat cushion 6 , and a headrest 8 , which is supported at the upper end portion of the seat back 7 .
  • the fore-and-aft position of the seat main body 5 is adjustable by the slide mechanism, and the vertical position of the seat main body 5 is adjustable by the lifter mechanism 10 .
  • a seat occupant of the seat main body 5 adjusts the vertical position of the seat main body 5 in accordance with the size of the seat occupant, for example, to obtain a desired eye level.
  • FIGS. 2 and 3 are plan view and exploded perspective view showing the framework of the seat main body 5 .
  • one end (first end) of a front link 12 is rotationally coupled to the front section of each bracket 4 by a support shaft 11 .
  • One end (first end) of a rear link 14 is rotationally coupled to the rear section of each bracket 4 by a support shaft 13 .
  • the front links 12 and the rear links 14 extend rearward with respect to the associated support shafts 11 , 13 .
  • One end (first end) of a tilt link 16 is rotationally coupled to the other end (second end) of each front link 12 by a support shaft 15 .
  • the tilt links 16 extend forward with respect to the support shafts 15 .
  • the front section and the rear section of a lower arm 19 are respectively rotationally coupled to the longitudinally middle portion of each tilt link 16 and the other end (second end) of each rear link 14 by support shafts 17 , 18 .
  • the lower arms 19 form the framework of side portions of the seat cushion 6 .
  • Seat back frames 7 a which form the framework of the side portions of the seat back 7 , are supported on the rear end portions of the lower arms 19 via reclining mechanisms 20 .
  • Each rear link 14 has an extended portion 14 a , which extends further rearward from the support shaft 13 (the coupling portion between the bracket 4 and the rear link 14 ) than the support shaft 18 (the coupling portion between the lower arm 19 and the rear link 14 ).
  • the extended portions 14 a are respectively secured to end portions of a beam member extending in the seat widthwise direction, which is a rear coupling rod 31 in the first embodiment.
  • the support shafts 17 are respectively secured to the end portions of a front coupling rod 32 , which extends in the seat widthwise direction.
  • One end (first end) of a swing link 22 is rotationally coupled to the other end (second end) of each tilt link 16 by a support shaft 21 .
  • the swing links 22 extend upward with respect to the support shafts 21 .
  • the front section of the cushion member which is a cushion pan 24 in the first embodiment, is rotationally coupled to the other ends (second end) of the swing links 22 by support shafts 23 .
  • the cushion pan 24 is formed into a substantially square dish-like shape matching the substantially square shape formed by the lower arms 19 and the rear coupling rod 31 .
  • the rear portion of the cushion pan 24 is rotationally coupled to the rear coupling rod 31 .
  • the cushion pan 24 forms the framework of the seat cushion 6 , and retains a seat cushion material.
  • the rear link 14 located on the left side when facing forward of the seat includes a substantially sectorial gear portion, that is, a sector gear 14 b , which widens toward the front about the support shaft 18 .
  • a rotation transmitting member which is a lifter drive device 33 in the first embodiment, is secured to the outer surface of the lower arm 19 located on the left side when facing forward of the seat (hereinafter, referred to as a lower arm 19 L).
  • the lifter drive device 33 includes an electric motor 33 a and a pinion 33 b .
  • the pinion 33 b is rotated by the electric motor 33 a via an appropriate speed reduction mechanism.
  • the pinion 33 b extends through the lower arm 19 L and meshes with the sector gear 14 b.
  • the rear link 14 L which meshes with the pinion 33 b of the sector gear 14 b , acts to rotate about the support shaft 18 .
  • the bracket 4 (the upper rail 3 ) cannot move in the vertical direction.
  • the support shaft 18 moves vertically with respect to the support shaft 13 together with the rear portion of the lower arm 19 L.
  • the pinion 33 b which meshes with the sector gear 14 b , is locked by the speed reduction mechanism.
  • the lower arm 19 L and the rear link 14 L, which support the pinion 33 b (the lifter drive device 33 ) are substantially integrated.
  • the lifter drive device 33 constitutes the lifter mechanism 10 .
  • the tilt link 16 located on the left side when facing forward of the seat (hereinafter, referred to as a tilt link 16 L) includes a substantially sectorial gear portion, that is, a sector gear 16 a , which widens toward the rear about the support shaft 17 .
  • a front tilt drive device 34 is secured to the outer surface of the lower arm 19 L to be located forward of the lifter drive device 33 .
  • the front tilt drive device 34 includes an electric motor 34 a and a pinion 34 b , which is rotated by the electric motor 34 a via an appropriate speed reduction mechanism.
  • the pinion 34 b extends through the lower arm 19 L and meshes with the sector gear 16 a.
  • the tilt link 16 L which meshes with the pinion 34 b at the sector gear 16 a , acts to rotate about the support shaft 17 .
  • the front link 12 which is coupled to the bracket 4 (the upper rail 3 ) cannot move in the vertical direction.
  • the support shaft 17 moves vertically with respect to the support shaft 15 together with the swing link 22 and the front section of the lower arm 19 L.
  • the pinion 34 b which is meshed with the sector gear 16 a , is locked by the speed reduction mechanism.
  • the lower arm 19 L and the tilt link 16 L, which support the pinion 34 b (the front tilt drive device 34 ) are substantially integrated.
  • the front tilt drive device 34 constitutes a tilt mechanism 30 .
  • the operation of the lifter mechanism 10 will be described on the assumption that the front tilt drive device 34 is stopped, and the tilt link 16 and the swing link 22 are substantially integrated with the lower arm 19 , which supports the front tilt drive device 34 .
  • the bracket 4 (the upper rail 3 ), the front link 12 , the rear link 14 , and the lower arm 19 configure a quadric crank chain that uses the lower arm 19 as a connector (connecting link).
  • the bracket 4 (the upper rail 3 ), the front link 12 , the rear link 14 , and the cushion pan 24 configure a quadric crank chain that uses the cushion pan 24 as a connector.
  • the rear coupling rod 31 which couples the rear portion of the cushion pan 24 and the rear links 14 to each other, is arranged rearward of the support shafts 18 , which couple the lower arms 19 and the rear links 14 to each other. That is, the distance between the rear coupling rod 31 and the support shafts 13 is greater than the distance between the support shafts 18 and the support shafts 13 . Thus, the cushion pan 24 is moved upward by a greater amount than the lower arms 19 by an amount corresponding to the difference between the distances.
  • the cushion pan 24 also moves substantially downward.
  • the rear section of the cushion pan 24 moves downward by an amount that is larger than the amount by which the lower arms 19 moves, and the difference in the moved amounts corresponds to the aforementioned difference in the distance.
  • the distance between the cushion pan 24 and the reclining mechanisms 20 changes.
  • the distance is reduced when the vertical position of the seat main body 5 moves upward.
  • the distance is increased when the vertical position of the seat main body 5 moves downward as the lifter mechanism 10 performs adjustment.
  • the cushion pan 24 the seat cushion 6
  • the upward movement of the lower arms 19 the seat back 7
  • the cushion pan 24 the seat cushion 6
  • the downward movement of the lower arms 19 the seat back 7
  • the cushion pan 24 (the seat cushion 6 ) is limited as compared to that of the cushion pan 24 (the seat cushion 6 ).
  • the lifter mechanism 10 of the first embodiment limits the vertical movement of the seat back 7 even when the seat cushion 6 is moved vertically by a large amount to adjust the position of an eye level of the seat occupant.
  • the tilt mechanism 30 will now be described on the assumption that the lifter drive device 33 is stopped. At this time, the tilt link 16 , the lower arm 19 , the swing link 22 , and the cushion pan 24 configure a quadric crank chain that uses the swing link 22 as the connector.
  • the tilt link 16 acts to rotate about the support shaft 17 .
  • the support shaft 17 moves upward with respect to the support shaft 15 together with the swing link 22 as shown in FIG. 6 .
  • the cushion pan 24 rotates about the rear coupling rod 31 in the clockwise direction, and the front section of the cushion pan 24 (the seat cushion 6 ) moves upward.
  • the seat back frames 7 a (the seat back 7 ), which are supported on the rear end portions of the lower arms 19 via the reclining mechanisms 20 , are generally held stopped, and are retained at the current position.
  • the tilt link 16 acts to rotate about the support shaft 17 .
  • the support shaft 17 moves downward with respect to the support shaft 15 together with the swing link 22 .
  • the cushion pan 24 is rotated in the counterclockwise direction about the rear coupling rod 31 , and the front section of the cushion pan 24 (the seat cushion 6 ) moves downward.
  • the seat back frames 7 a (the seat back 7 ), which are supported on the rear end portions of the lower arms 19 via the reclining mechanisms 20 , are generally held stopped, and are retained at the current position.
  • the tilt mechanism 30 of the first embodiment allows only the vertical position of the front section of the seat cushion 6 to be adjusted while hardly moving the seat back 7 .
  • the first embodiment has the following advantages.
  • the upward movement of the seat back 7 is limited as compared to that of the cushion pan 24 (the seat cushion 6 ).
  • This allows the S-curve of the back and the S-curve of the seat back to be matched.
  • a large person moves the cushion pan 24 (the seat cushion 6 ) downward by a large amount
  • the downward movement of the seat back 7 is limited as compared to that of the cushion pan 24 (the seat cushion 6 ). This allows the S-curve of the back and the S-curve of the seat back 7 to be matched in the same manner.
  • the lengths of the front links 12 and the rear links 14 do not need to be increased.
  • the required strength and rigidity of the front links 12 and the rear links 14 are reduced, and the mass of the front links 12 and the rear links 14 is reduced.
  • a gap between the headrest 8 retained at the upper end of the seat back 7 and the ceiling is sufficiently ensured.
  • the rear coupling rod 31 is secured to the rear links 14 so as to extend between the rear links 14 .
  • the rear section of the cushion pan 24 (the seat cushion 6 ) is coupled to the rear links 14 via the rear coupling rod 31 .
  • the rear section of the cushion pan 24 (the seat cushion 6 ) is further firmly coupled to the rear links 14 .
  • the cushion pan 24 solely supports the weight of the seat occupant applied to the seat surface.
  • the structure of the cushion pan 24 is significantly simplified.
  • the tilt mechanism 30 tilts the front section of the cushion pan 24 using the rear section of the cushion pan 24 as a fulcrum, and further finely adjusts the seat position as desired.
  • the vertical movement of the front section of the cushion pan 24 is ensured to be greater than that of the lower arms 19 , the vertical movement of the front section of the seat cushion 6 is increased without increasing the vertical movement of the lower arms 19 (the reclining mechanisms 20 , the seat back 7 ) moved by the lifter mechanism 10 .
  • the change amount of the seat surface angle is increased.
  • FIGS. 7 and 8 are an exploded perspective view and a side view illustrating the framework of the seat main body 5 .
  • a beam member of the second embodiment which is a rear side coupling rod 41 , integrally includes a pair of shaft portions 41 a and an eccentric portion 41 b .
  • the shaft portions 41 a are arranged on the end portions of the rear side coupling rod 41 .
  • the eccentric portion 41 b has an axis that is translated from the axis of the shaft portions 41 a and connects the shaft portions 41 a .
  • the shaft portions 41 a are respectively secured to the rear end portions of the rear links 42 , and are rotationally coupled to the rear portions of the lower arms 19 .
  • the eccentric portion 41 b is arranged further rearward from the support shafts 13 (the coupling portions between the brackets 4 and the rear links 42 ) than the shaft portions 41 a (the coupling portions between the lower arms 19 and the rear links 42 ).
  • the structure of the rear links 42 of the second embodiment is similar to that of the first embodiment except that the extended portions ( 14 a ) are omitted.
  • a cushion member 45 including a cushion pan 46 and spring members, which are S-springs 47 is used in the second embodiment instead of the cushion pan 24 .
  • the cushion pan 46 forming the front portion of the cushion member 45 is formed into a substantially square dish-like shape, and includes a pair of mounting pieces 46 a , which extend rearward from both ends in the seat widthwise direction.
  • the rear portion of the cushion pan 46 is rotationally coupled to the longitudinally middle portions of the lower arms 19 (the portion sandwiched between the support shaft 17 and the shaft portion 41 a ) via the mounting pieces 46 a with support shafts 48 .
  • the front section of the cushion pan 46 is rotationally coupled to the other ends (second end) of the swing links 22 by the support shafts 23 .
  • the S-springs 47 forming the rear portion of the cushion member 45 extend in the fore-and-aft direction while being bent and arranged side by side in the seat widthwise direction.
  • the front ends of the S-springs 47 are engaged with engaging portions 46 b arranged on the rear end of the cushion pan 46 .
  • the rear ends of the S-springs 47 are rotationally engaged with the eccentric portion 41 b of the rear side coupling rod 41 . That is, the S-springs 47 are coupled to the eccentric portion 41 b , which is arranged further rearward from the support shafts 13 (the coupling portions between the brackets 4 and the rear links 42 ) than the shaft portions 41 a (the coupling portions between the lower arms 19 and the rear links 42 ).
  • the operation of the lifter mechanism 10 will be described on the assumption that the front tilt drive device 34 is stopped, and the tilt link 16 and the swing link 22 are substantially integrated with the lower arm 19 that supports the front tilt drive device 34 .
  • the bracket 4 (the upper rail 3 ), the front link 12 , the rear link 42 , and the lower arm 19 configure a quadric crank chain that uses the lower arm 19 as the connector (connecting link).
  • the cushion member 45 also moves substantially upward.
  • the eccentric portion 41 b which couples the rear end portions of the S-springs 47 and the rear links 14 to each other, is arranged rearward of the shaft portions 41 a , which couple the lower arms 19 and the rear links 14 . That is, the distance between the eccentric portion 41 b and the support shafts 13 is greater than the distance between the shaft portions 41 a and the support shafts 13 . Therefore, the cushion member 45 moves upward by a greater amount than the lower arms 19 by an amount corresponding to the difference between the distances.
  • the cushion member 45 As the front links 12 and the rear links 42 are rotated, the cushion member 45 also moves substantially downward.
  • the rear ends of the S-springs 47 move downward by an amount that is larger than the amount by which the lower arms 19 moves, and the difference in the moved amounts corresponds to the aforementioned distance difference.
  • the cushion member 45 the seat cushion 6
  • the downward movement of the lower arms 19 the seat back 7
  • the positional displacement of the rear ends of the S-springs 47 with respect to the cushion member 45 is absorbed by the elastic deformation of the S-springs 47 .
  • the tilt mechanism 30 will now be described on the assumption that the lifter drive device 33 is stopped. At this time, the tilt link 16 , the lower arm 19 , the swing link 22 , and the cushion pan 46 configure a quadric crank chain that uses the swing link 22 as the connector.
  • the tilt link 16 acts to rotate about the support shaft 17 .
  • the support shaft 17 moves upward with respect to the support shaft 15 together with the swing link 22 .
  • the cushion pan 46 rotates in the clockwise direction about the support shaft 48 , and the front section of the cushion pan 46 (the seat cushion 6 ) moves upward.
  • the seat back frames 7 a (the seat back 7 ), which are supported on the rear end portions of the lower arms 19 via the reclining mechanisms 20 , are generally held stopped, and are retained at the current position.
  • the tilt link 16 acts to rotate about the support shaft 17 .
  • the support shaft 17 moves downward with respect to the support shaft 15 together with the swing link 22 .
  • the cushion pan 46 rotates in the counterclockwise direction about the support shaft 48 , and the front section of the cushion pan 46 (the seat cushion 6 ) moves downward.
  • the seat back frames 7 a (the seat back 7 ), which are supported on the rear end portions of the lower arms 19 via the reclining mechanisms 20 , are generally held stopped, and are retained at the current position.
  • the rotational center (the support shaft 48 ) of the cushion pan 46 is arranged closer to the support shaft 23 as compared to the rotational center (the rear coupling rod 31 ) of the cushion pan 24 of the first embodiment.
  • the front section of the cushion pan 46 (seat cushion 6 ) is vertically moved by a larger amount as compared to that of the first embodiment.
  • the second embodiment has the following advantages in addition to the advantages (1), (2), (4), and (5) of the first embodiment.
  • the rear side coupling rod 41 (the beam member) is used both as the coupling portion (the shaft portions 41 a ) between the rear links 42 and the lower arms 19 , and also as the coupling portion (the eccentric portion 41 b ) between the rear links 42 and the rear section of the cushion member 45 .
  • the rear side coupling rod 41 is easily formed by simply bending the conventional rear side coupling rod to couple the S-springs 47 .
  • the rear section of the lower arms 19 and the rear section of the cushion pan 24 may be respectively coupled to the shaft portions 41 a and the eccentric portion 41 b of the rear side coupling rod 41 as in the second embodiment.
  • the rear section of the lower arms 19 and the rear end portions of the S-springs 47 may be respectively coupled to the support shafts 18 and the rear coupling rod 31 as in the first embodiment.
  • an operating knob which serves as a rotation transmitting member that transmits the operating force for rotating the rear link 14 ( 14 L), may be employed instead of the lifter drive device 33 .
  • the lifter drive device 33 may rotate the front link 12 instead of the rear link 14 ( 14 L) to vertically move the lower arms 19 .
  • the tilt mechanism 30 may be omitted.

Landscapes

  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Seats For Vehicles (AREA)
US13/819,826 2010-09-17 2011-09-14 Seat lifter device Expired - Fee Related US8616645B2 (en)

Applications Claiming Priority (3)

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JP2010209784 2010-09-17
JP2010209784A JP5218506B2 (ja) 2010-09-17 2010-09-17 シートリフター装置
PCT/JP2011/071019 WO2012036212A1 (ja) 2010-09-17 2011-09-14 シートリフター装置

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US20130161989A1 US20130161989A1 (en) 2013-06-27
US8616645B2 true US8616645B2 (en) 2013-12-31

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EP2617601B1 (en) 2015-05-06
US20130161989A1 (en) 2013-06-27
JP2012062020A (ja) 2012-03-29
EP2617601A4 (en) 2013-10-16
JP5218506B2 (ja) 2013-06-26
WO2012036212A1 (ja) 2012-03-22
EP2617601A1 (en) 2013-07-24

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